Discontinued Operations (Details) - USD ($)	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Discontinued Operations and Disposal Groups [Abstract]
Net revenue	$ 0	$ 0	$ 0	$ 4,343,008
Cost of revenue	0	0	0	2,374,251
Gross profit	0	0	0	1,968,757
Operating expenses:
General, administration and sales	0	0	0	1,252,222
Research and development	0	0	0	35,920
Total operating expenses	0	0	0	1,288,142
Operating income	0	0	0	680,615
Other expense, net	0	0	0	(140,923)
Income before taxes	0	0	0	539,692
Provision for income taxes	0	0	0	7,589
Net income from discontinued operations	$ 0	$ 0	$ 0	$ 532,103